Improvement in calipers



. Leiters Patent No. 108,640, dated october 25,1810.

'.IMPRYovEYMENT INr cALlPEus.

The Schedule referred to in these I lettezs Prateut and making part of the same.

Be itL known that I, WILLIM A. SHAPP, lof Syr 'aeuse,'in the county of Onondaga and State of New York, have invented a new and improved Caliper,

. which AId euominate the Universal Galipe1';'and .l du

'herein' declare and ascertain my said invention, referj ring tothe accompanying drawings, in which- -Figure"'l'sliows the caliper readyir use. .Figure 2 the same opened as a baicompass. Calipers as heretofore made can be used only for the one purpose ofmeasuliugauoutside or au inside sur-1f`fA face, and, from their construction, are incapable of measuring both at the same end nor can they be used for any other purpose, while my new calipers can be applied to various 'uses with equal facility, as will hereafter appear, serving the .purpose of every descriptionv of caliper, for Compasses, and for serihing and for measuring augles.

The construction is as follows:

Two legs, b, are formed like ordinary calipers; as in ordinary calipers or Compasses, as clearly seen in "the drawings; they are are jointed together at a, the `joint which I prefer being a rivet aud caps. n

At the opposite end of cach of the legs 7) I joint-a foot-piece,c, consisting ot' a short pointed piece of hardened steel or other suitablesubstzuice.

In'the drawings, iig. l, these points'are turned iuward, making the instrument a caliper" for measuring external surfaces thc red lilies show the point-s re-n rersed 'for internal measurement, the dotted lines show ,the position for Compasses; theproper positions for the other-uses will readily be understood and applied by the competent mechanic.

lo use the'calipers as har-compa'sses, thc logs must he stretched out as shown in iig. 2.

'lhe instrument thus constructed is intended for the fallen-*ing purposes:

More the points 1u toward cach other, as in iis. 1,.

-and it is a caliper-for outside surfaces or screw-threads;

in this case it is important to have the feetc point ex* actly in the salue line toward each other, to effectwhich the legs b are a little twisted; more one point ,y or foot into line with the leg,'as indicated by the blue-.4,

lines, lig. 1, and it becomes a center caliper, either iu- .sideor outside; move the points both outward,'and

it is an inside' caliper, as indicated by the red lines, il". I: turn one point in and the other out, and it is a parallel caliper, with 'one "point folded 1u onto the` leg, andtheA other out in 'line with t-heleg, and it is 1a sci'ibe-gauge; tui'u both points ont intoliue with the l legs, andthe instruments are :ordinary coxnpasses;

openthe two legs out intofa straight line, and tui-u the feet c down at right angles, and it Forms bar-conipasses. v

The head t can he marked as'au index for opening 'the legs to iudieate-auy--degree of angle fora threadchisel or other-gage, I prefer jointing the feet c to the legs' b with a rivet, the holes slightly countersunk and the ends of 'the rivets somewhat full or oval, so as to contain material i'or tightening -as it becomes .loose by wear.

It will be noticed from the .above ,description that .-I y

have', iu a simply-constructed caliper, an instrument of -very varied application, by joiutiug the lower ends of ,the legs, as described, at a cost about the saune as either one ot' them alone.

` Having thus fully described my universal calipeis,

That I claim is Calipers u-ithfmovable points, constructed and formed substantially in the manner as shown auddescribed. y y

- W. A. SHARP?.

lVitn'esses: J. J." GREENOUGH,

M. G: Homann.

strat ".@iiim y. 

